M'GILVRAY: in the dexter chief [top band] a dexter hand couped fesseways
gu. holding a dagger, in pale [vertically], of the second.

The only name on your list that's mentioned as having an Irish origin is:

LAMONT or LAMOND (that Ilk, originally from Ireland): Crest... A hand
couped at the wrist.

May be off base, but it's a thought.

Also found this which may be of interest to you.

Funeral Hatchments

One piece of heraldry carried in the [funeral] procession was a
diamond-shaped board painted with the arms of the deceased. A
descriptive word for coat of arms with all its surrounding features is...
an 'achievement'; from this term is derived the word "hatchment", the
name eventually applied to this diamond-shaped board. In time, two
hatchments were painted, but not for carrying in the procession. One was
hung above the main door of the deceased's home and the other was
displayed at the place of interment; often this would be inside the
family vault.

Scotland has over 50 surviving funeral hatchments... which are scattered
across the country. There are two concentrated collections: at Luss
Parish Kirk [Argyll] beside Loch Lomond, commemorating members of the
Colquhoun of Luss family, and at Weem Old Kirk in Perthshire which is the
burial place of the Menzies of that Ilk.